2018 Yukon 5.3 with 101k miles. Just had the check engine light and the StabiliTrak light come on. Started to idle rough. Codes P0206 (Injector Circuit / Open - Cylinder 6) and code P0306Cylinder 6 Misfire Detected. It was very sudden. Didn't even notice the light was on till I got home from a quick trip to the store. Thoughts?